0x01: (name=i_state) L1 writebacks to L2 in I state (misses)
0x02: (name=s_state) L1 writebacks to L2 in S state
0x04: (name=e_state) L1 writebacks to L2 in E state
0x08: (name=m_state) L1 writebacks to L2 in M state
0x0f: (name=mesi) All L1 writebacks to L2

0x01: (name=to_fp) Transitions from MMX to Floating Point instructions
0x02: (name=to_mmx) Transitions from Floating Point to MMX instructions
0x03: (name=any) All Floating Point to and from MMX transitions